package mailSendService.config;

import org.springframework.aop.interceptor.AsyncUncaughtExceptionHandler;
import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.AsyncConfigurer;
import org.springframework.scheduling.annotation.EnableAsync;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;

import java.util.concurrent.Executor;
import java.util.concurrent.ThreadPoolExecutor;

@EnableAsync
@Configuration
public class TastExecutorConfig implements AsyncConfigurer {

    /** Set the ThreadPoolExecutor's core pool size. */
    private final int corePoolSize = 10;
    /** Set the ThreadPoolExecutor's maximum pool size. */
    private final int maxPoolSize = 200;
    /** Set the capacity for the ThreadPoolExecutor's BlockingQueue. */
    private final int queueCapacity = 10;

    private final String threadNamePrefix = "MyLogExecutor-";

    public Executor getAsyncExecutor() {
        ThreadPoolTaskExecutor threadPoolExecutor = new ThreadPoolTaskExecutor();
        threadPoolExecutor.setCorePoolSize(corePoolSize);
        threadPoolExecutor.setMaxPoolSize(maxPoolSize);
        threadPoolExecutor.setQueueCapacity(queueCapacity);
        threadPoolExecutor.setThreadNamePrefix(threadNamePrefix);

        // rejection-policy：当pool已经达到max size的时候，如何处理新任务
        // CALLER_RUNS：不在新线程中执行任务，而是有调用者所在的线程来执行
        threadPoolExecutor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
        threadPoolExecutor.initialize();
        return threadPoolExecutor;
    }

    public AsyncUncaughtExceptionHandler getAsyncUncaughtExceptionHandler() {
        return new AsyncUncaugthExceptionHandler();
    }
}
